Chimney cowls and ventilating devices



Jan. 23, 1962 c. E. BREWER 3,017,818

CHIMNEY COWLS AND VENTILATING DEVICES Filed March 27, 1959 FIG. 2

[NVENTOE CZ; 76rd Edmund Brew 6r ATTOEA/E Y5 3,l7,8l8 Patented Jan. 23, 1962 "ice 3,017,818 CHIMNEY COWLS AND VENTILATING DEVICES Clifford Edmund Brewer, Lucky Stars, Lagoon Road, Lilliput, Parlrstone, Dorset, England Filed Mar. 27, 1959, Ser. No. 802,372 Claims priority, application Great Britain Apr. 3, 1958 2 Claims. (CI. 98-82) The present invention relates to chimney cowls and ventilating devices of the type which includes a vertical portion adapted to be located substantially in coaxial relationship with respect to the chimney and situated above and normally outside the diameter of the chimney to form a cowling and shaped to create a reduced pressure in the flue or air duct.

For the purpose of describing and claiming this invention this type of ventilating device will be referred to as a cowl.

In the complete specification accompanying my copending application No. 802,374, filed March 27, 1959, there is described a cowl of the type above referred to in which is provided a central upstanding portion coaxially arranged with the chimney and extending from the top of the chimney for a substantial distance iupwardly into the body of the cowl.

According to the present invention a cowl of the type described above is provided with means for mounting upon a chimney pot or flue stack pipe so that the pot or stack extends into the vertical portion of the cowl. In this way the same effect is achieved as with the cowl described and claimed in the aforesaid complete specification but in the present invention the portion of the chimney pot or flue stack pipe extending into the vertical portion of the cowl takes the place of the central upstanding portion in the construction described and claimed in the said complete specification.

Of course the present invention is applicable only to chimney or stack pipes which provide a tubular upstanding portion such as a chimney pot over which the cowl maybe fitted.

Conveniently the cowl can be provided with a fitting which not only allows it to be applied to chimney pots or flue stack pipes of varying diameters within the limits imposed by the dimensions of the cowl but the cowl can also be provided with means permitting the cowl to be adjusted vertically with respect to the chimney pot or flue stack pipe so as to adjust the amount of the pot or pipe extending into the cowl.

The invention will now be described with reference to the accompanying drawings in which:

FIGURE 1 shows a perspective view of a cowl in accordance with the present invention mounted upon a chimney pot;

FEGURE 2 shows a vertical section through the cowl mounted upon a stack pipe and FIGURE 3 shows an underneath plan of the cowl on the stack pipe.

Referring to the drawings the cowl body comprises four vertically arranged arcuate members 1 arranged to form a cowl shape of known form having vertical air slots between the arcuate members 1. The arcuate memhers I are arranged upon a metal annulus 2 by rivets 3 and the top of the cowl ts closed by a dish shaped cover 4 which likewise can be rivetted to the vertical arcuate members.

The annular member 2 is of such a diameter as to slip over the top of a chimney pot or stack pipe and this member carries a number of screws 5 which are provided with a screw slot or with a nut head and by turning toe screws they can be tightened against the stack pipe or chimney pot 6.

Extending upwardly from the annular member and conveniently located on the rivets 3 are a number of hook members 7 which are angled inwardly from the annular member 2 and can be bent so that the hook portion engages over the top of the chimney pot or stack pipe 6.

As will be seen when in position the chimney pot or stack pipe 6 extends for a considerable distance, and in this particular example substantially halfway, into the cowl so that the cowl being open at its lower end, air is drawn up upwardly into the cowl past the chimney pot and out at the upper end of the cowl to draw smoke upwardly out of the chimney.

If desired the hook members 7 can be made vertically adjustable on the annular member 2 so that the amount that the stack pipe or chimney pot extends into the cowl can be adjusted.

The annular member itself may be made of such a size that the cowl can be secured to a number of different sizes of chimney pots or stack pipes.

It will be realised that other means for securing the cowl upon the chimney stack can be employed and for example the annular member may carry or be replaced by spring means which automatically adjusts itself to a size of chimney to hold the cowl in position and at the desired distance down the chimney pot. Thus the annular member 2 or other mounting for the arcuate members 1 may carry leaf or other springs which are inwardly directed and which can be made to flex outwardly automatically to adjust themselves to the outer diameter of the chimney pot or stack pipe.

The cowl can be made of any suitable material, for example sheet metal or asbestos sheeting, and in the latter event the chimney pot or stack pipe is also made of asbestos and can be formed integrally with the cowl allthough in this case the cowl will not be adjustable vertically with respect to the pot or stack pipe.

The cowl of the present invention may if desired embody ISllCh features as are applicable of the cowls idescri'bed in the complete specifications of my co-pending applications Serial No. 758,490, filed September 2, 1958, now Patent 2,988,982, Serial No. 758,537, filed September 2, 1958 and Serial No. 802,374, filed March 27, 1959.

Whilst normally the annular member is circular since the majority of chimney pots are circular in cross section the annular member may be made of any configuration to fit the configuration of the chimney and for example may be square in which case a screw and a hook member will be provided to engage each face of the chimney pot.

What I claim is:

'1. A cowl comprising a hollow body having vertically extending side walls, a top wall closing the upper end of the body, and lengthwise extending apertures in the side walls; the said body being open at its lower end for receiving therein the upper end of a chimney pot and the open lower end being larger than the chimney pot to define therewith an opening surrounding the chimney pot and leading to the interior of the body; and means wholly located within the body for supporting the body on the chimney pot so that the pot extends a substantial distance into the body, the said supporting means including radially adjustable means accessible through the said apertures for locking the body to the chimney pot so that the body can be secured to chimney pots having different external dimensions.

2. A cowl comprising a hollow body formed by a plurality of upwardly extending, transversely concave members, a cover member secured across the top of the upwardly extending members and closing the top of the hollow body, and an annular member secured to the inner face of the lower ends of the upwardly extending members; the said upwardly extending members being supported by said cover member and said annular member so that the upwardly extending members are spaced one from another to provide vertically extending slots therebetween, a plurality of hook members secured to and extending upwardly from said annular member, hookv portions at the upper ends of said hook members for engaging over the upper end of a chimney pot inserted into the'said body for supporting the body on the chimney pot, and a plurality of screw elements threadingly engaged in said annular member and extending radially inwardly thereof for engaging the chimney pot to lock the body to the pot, the said screw elements being located on said annular member in register with the said slots so as to be accessible from outside the body.

References Cited in the file of this patent UNITED STATES PATENTS FOREIGN PATENTS Great Britain France Jan. 6, Canada Oct. 1 

